Key hole plug



FIG. 1 is a top, front and left side perspective view of a key hole plug showing my new design;

FIG. 2 is a side elevational view thereof, the opposite side being identical;

FIG. 3 is a front elevational view thereof, the rear being identical;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a key hole plug, as shown and described. 